Mold Assessment - Level I
An IESO Level I Assessment is used to evaluate and characterize a visible suspected mold colonization on a
surface. It is used to determine whether a stain, discoloration, blemish, raised material or other irregular
appearance on a surface is, in fact, mold.
A minimum of two physical surface samples must be collected and tested: one from the suspect area and
another from a non-suspect surface that is similar in material and physical characteristics but is free of stain,
discoloration, blemish, mold-like substance or irregular appearance and appears to be free of active or dormant
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